United Systems Alliance
Freedom* and demockracy** for all***.
*Except when we need to catch Al-Kind-Of and OASIS terrorists.
**Except the president doesn't need a majority to win and congressional districts are drawn with etch-a-sketches.
***Except dappers, explosionists, peaches, aliens, and gurls.
The United Systems Alliance prides itself on being the most free, equal, demockratic, rich, advanced, influential, and powerful nation in the BrikVerse*. Additionally, the USA can tout the highest Gross Domestic Product in the Nehellenium Galaxy**, and also by far and away the highest incidence of non-military mass shootings (a point of pride among more traditional minifigs favoring a return to violence and khaos).
*despite Space Canada being freer, the Unified Republik of Poland being more tolerant, the United Klingdom being more demockratic, Trattoria being richer per capita, the Time-Traveling Super Jews being more advanced, the Space Mafia having more influence over international politics, Assyria having a bigger army and Praetoria having a bigger navy. **only by nominal GDP, not by GDP with purchasing power parity.
President Dolan Trump is the "elected" leader of the United Systems Alliance and supposedly the rest of the free galaxy. He repeatedly promised to make Emeria pay for and build a space wall as well as to make the USA great again, and otherwise has almost no idea what he wants to do. He will also declare war on any nation whose leaders dare say he has small hands.
The Secret Service is tasked with the important duty of protecting the USA President with their lives, no matter who he is.
As a further safeguard in case the Secret Service isn't enough, Dolan Trump has also taken out assassination/impeachment insurance in the form of Vice President Mike "fabulous conversion thesnuggly" Pence.

USA super-soldier Captain Murica serves as an inspirational role model and war hero to the troops, wielding a shield enchanted with PATRIOTISM and riding a motorcycle into battle.

Standard USA troops led by a Red Beret. The USA hasn't levied a draft in several decades, resulting in a military force filled entirely with the most hardcore, diehard 'Murican patriot volunteers.

A USA recon drone being controlled by a soldier. Lightly armed with a small machine gun, its main purpose is to scout out enemy positions.

A USA hardsuit, for wielding big weapons and lifting objects too heavy for infantrymen. This design was mostly taken from Silent-sigfig.

The USA
Attaché mech is a complement to the existing Emancipator platforms, designed for infantry support and anti-vehicle roles.

Its guns can rotate up and down to switch between infantry and aircraft. It also mounts missiles as additional armament.

The Attaché also has a grappling hook (as opposed to a slash harken, because the USA military is not full of weebs), for pulling down statues of dictators and other purposes.

It also has a pair of jump-jets in the backs of its legs, for short hops across impassable terrain.

The USA
Commissioner hover-tank was originally built several G.R.'s ago during the B'lack Obama administration to address concerns over dwindling tread supplies and to provide a more modern alternative to the classic Diplomat-class tanks. Although it never did end up replacing the Diplomat, the latter receiving several upgrades instead, several Commissioners are still around within the USA armed forces.

The rear, with a hatch to the interior. Clips on the rear of the turret allow for interchangeable modules, such as an antenna or a missile pod.

The turret can seat minifigs, who can man the mounted machine guns. The main gun can also move up and down, but IRL it's really fragile so I usually don't.
View of the hover engines underneath the armor skirt.

The USA
Counsellor transport helicopter is designed to deploy and extract troops from the battlefield.

Side view.

The front and cockpit. Armament is light with only two machine guns, so usually an airstrike is called in to soften the landing zone first.

The interior has room to seat 5 standard USA troops.

The dual tiltrotors can swivel and move around for enhanced maneuverability and allow the Counsellor to turn on a dime.

The F-61
Demarché-class fighter-bomber is one of the biggest and heaviest fighters in the USA. These big boys are usually called in during airstrikes and can level good portions of cities in a bombing run.

A closer view of the cockpit with the pilot.

The Demarche mounts big engines to maintain an amazing speed for its size, both in atmosphere and in space.

It carries an impressive array of missiles and guns, including size-4 Peacekeeper missiles and several strafing guns that wouldn't be out of place on a tank.